Nuband Wireless Activity and Sleep tracker. Track steps, Distance and calories burned. Call/message notification with Free App on selected iOS and Android smart phones. Point touch screen. Activity and sleep tracker. Call/message notification. Connectivity32MB memory. Multi-platform operating system. Bluetooth 4 connection. USB 2 connection. Display information23.11mm AMOLED screen. Touchscreen. Battery55mAh battery capacity. Typical usage time of up to 7 days. Low usage time of up to 7 days. 2 hour charge. Physical specificationSize: one size. Watch size H40, W18, D10mm. Strap size L240, W16, T2mm. Strap can be removed and replaced. Weight 25g. FeaturesWater resistant. Dust resistant. Receive social network notifications. Pedometer. Distance. Accelerometer. Calories. Sleep. Manufacturer’s 2 year guarantee. EAN: 4894664008894.